Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb1437b26b22d76…

MALICIOUS

PDF

79.6 KB Created: 2021-03-20 08:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b44e2590cf562fa0890782eeaadc9bcb SHA-1: 1fb9f9e179f412b13a2689b4b449e756fbdfb517 SHA-256: bfb1437b26b22d760fa6b17e121a58aac9726859a5ff8dbd135b5c602c9f374e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to repairing a motorcycle jack, directing users to external URLs like https://soxebez.ru/aws?utm_term=how+to+repair+craftsman+motorcycle+jack. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of generating numerous links to potentially malicious or low-quality content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://soxebez.ru/aws?utm_term=how+to+repair+craftsman+motorcycle+jack PDF link annotation
    • https://cdn.sqhk.co/nosuterib/i7hggX2/korurivowukaterugela.pdfIn PDF document text
    • https://puzugisebo.weebly.com/uploads/1/3/1/4/131438758/feron.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/chficsp/afi_top_100_movies_2020.pdfIn PDF document text
    • http://dress-russia.ru/finding_perimeter_worksheets_5th_gradeuznlv.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/jgjcCja/99222448789.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/6hahadP/90s_music_videos_rock.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/9454935.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/e9hiJjg/zukivaxonavo.pdfIn PDF document text
    • http://roskycnmx.com/marathon_watch_reviewydxeb.pdfIn PDF document text
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/4010023.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/k6Hhdtn/up_bed_2019_answer_key_2019.pdfIn PDF document text
    • http://disconto50.info/11329912466ayt41.pdfIn PDF document text
    • https://vovepelit.weebly.com/uploads/1/3/5/3/135325097/lizem.pdfIn PDF document text
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/pebosofevavivoti.pdfIn PDF document text
    • https://cdn.sqhk.co/fokudiwun/hWeJhaX/implosion_never_lose_hope_full_apk_obb.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/936563951261z4sq.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/ajfhdXm/stars_live_wallpaper_video.pdfIn PDF document text
    • https://cdn.sqhk.co/dawolesirip/ijgfjdZ/subway_surfers_show_all_episodes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/ap_calculus_ab_derivative_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6166c6ca-2d8b-4bac-b0ae-e8f3cb866315/sivegozowodanakose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90776eea-a2d7-4fa5-ac79-ce39e54615a6/why_is_there_standing_water_in_my_water_softener_salt_tank.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/wavowewomovalemabupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2159f90-055f-4aa0-a3e1-27c1cee17f14/nifewiwalesedulafoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa273a2-0947-4b2a-8a3e-3a1fe0f28f95/how_much_does_a_retired_military_dog_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e74ce93-209f-4cdf-8eff-e36e86ce90b0/45736580139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 5456 bytes
SHA-256: 36763519f6e2b02559aaa81d6da101ca5328a22b632eb3d6bc31921984da7a8b
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 10812 bytes
SHA-256: 770b77dd56cb018053be239b3fd8cc5e9529b6a7e6566bfd25df42f23fe0629b

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