Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a9e3e78a579a5d…

MALICIOUS

PDF

84.5 KB Created: 2021-05-20 23:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 282816c70d8488b41aef02109ce9add6 SHA-1: f049b5d2f3170d4af1583f4a74733a36ee672a17 SHA-256: 77a9e3e78a579a5dcf08bd1f7ad5f244a78b4d23775cfbea21d093ca4e0f4a51
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+do+i+set+my+vivint+thermostat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385231/normal_6032cc883d0dd.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/7817268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60170a15625ca.pdfIn PDF document text
    • https://xoxekoxezugox.weebly.com/uploads/1/3/0/7/130738790/fobavepojuledapami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_601c681569bf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_600349068cff5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a6bf32-c5a5-42f8-8e89-6daf95391591/periodic_table_worksheet_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546e008f-0139-4bd6-83e5-b32df35111cd/kazebekenokaletadew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5200c87e-3f3e-4da7-aa3f-d6c108bf3f30/how_to_replace_ge_dryer_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/tosefosadinulapalejose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341eef35-70ce-4a5d-a668-d6db430cf858/how_to_find_volume_of_a_cuboid_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50aaaf33-c265-41cf-bb25-311427fcd8e4/illuminatus_trilogy_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5626cfea-0e54-4889-9e80-0c808b578f78/fine_woodworking_drafting_table_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/mexevuriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebac89bd-9f89-43f4-bc11-31908333aae4/how_do_i_setup_the_scanner_on_my_brother_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cba1be7-2731-4797-bd27-543c5db479d6/24598923577.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/tafapukepavurozalafonud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b0567e-cb86-4337-8f3f-517018555105/83120664856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4b2ada-788c-471e-a4d2-82c90ed7dc62/fopulizujotezozopidopen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6352cd6-37ed-4ae1-8024-2487f0113651/87049621584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3172e5d1-e7c0-4859-8452-e7c888c131d0/32312704043.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/bash_scripting_basic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f5de26-5b7a-484a-9335-eb4471093810/54743928063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba553bcc-0a44-4eb6-8b32-ef1abcbb6121/tasty_ultimate_cookbook_free_download.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_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 5248 bytes
SHA-256: 8841680aa8d052280b63ace5a41a5a889482c11c152b1f7c14d60ae5fcb63ac1
font_01_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 10740 bytes
SHA-256: f57b4c245490c35ef291bc4de10f37243c8e7773a10d4be670b7dd9a9e26006a