Malicious PDF — malware analysis report

Static analysis result for SHA-256 634aac8b6b3d0eba…

MALICIOUS

PDF

82.5 KB Created: 2021-05-04 00:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d1748978a80fefe5846ed06ad062b8a3 SHA-1: 2d011542eeaa6e45088f90c68b0a98fcb9b7b157 SHA-256: 634aac8b6b3d0eba1491d8979301123ca44b6dbfa1144cc0657c3ad4d0f8b9d7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as search results. The primary URL, 'https://golowaki.ru/strik?utm_term=what+is+the+best+stock+app+for+iphone', suggests a phishing or redirection attempt. The presence of a 'Download Button' heuristic and ClamAV detection further supports its malicious nature, likely serving as a lure to download further malware or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=what+is+the+best+stock+app+for+iphone PDF link annotation
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/zuwusunisokimiluj.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/1337928.pdfIn PDF document text
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/8666735.pdfIn PDF document text
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/fasexegadu-vefasido-kodeki.pdfIn PDF document text
    • https://rovajomodurimof.weebly.com/uploads/1/3/4/7/134719391/suvekepova.pdfIn PDF document text
    • https://jezasozogederek.weebly.com/uploads/1/3/5/9/135960593/a60598944.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/2c694c580eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fd804dcd-fc5f-47c2-ab65-2f03355c32e5/does_burger_king_apple_pay.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/adb_root_android_6._0._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccce3e5-f040-494f-9071-6453a1ebdb7d/wodafudulowiwivinasijiwol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f646fbb-9a19-4772-a1b9-c30aeb1d0af1/89342187917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2759ac8-efd4-41b0-ba2a-843e643b3a39/woodcock_johnson_iv_test_of_cognitive_abilities_sample_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f991d61b-2ed8-48ec-9a25-789d7e0b452b/unit_operations_of_chemical_engineering_6th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/sony_rx100_mark_7_sample_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aabdd22-adb0-41c3-acdd-058380050dd8/radio_shack_pro-106_digital_trunking_handheld_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/nolirojekafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62aecc9-8c53-4ad9-bf9c-6d1e61802e4f/27395878531.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/the_far_side_of_the_moon_robert_lepage_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f7ec51-8789-421c-b17a-4e70408e2bed/skyrim_how_to_alchemy_loop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae0b5e5-cad8-420f-a750-1f384f313cce/how_much_does_handwriting_without_tears_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a98919-62dc-4ff8-bdea-18f3967d94a1/carrier_weathermaker_8000_error_code_33.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/bikufaxoboritogebowakusod.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/habanera_string_quartet_sheet_music.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5076 bytes
SHA-256: a02849831dfff80cb8535aac5beb1968fb92cb885d39969eceba4b69747704b4
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 11308 bytes
SHA-256: 9fc418c147df1610d3aba384a33594fc6f518d75ef610ed7c04433f39bd53ce0
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333