Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b45084d9fd0b3d…

MALICIOUS

PDF

125.8 KB Created: 2021-04-07 23:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb6870e7f742a853dc3236272403e78b SHA-1: 8dfd59cc2aa800413873e27c86fb12843bfc2f3e SHA-256: d2b45084d9fd0b3ddc90a6e56eea778066f87f80aeb1a3d92d3185455fc998da
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=spider+man+unlimited+apk+free+download PDF link annotation
    • http://babysampler.com/kuzivakd9cv.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/9134789.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/vexamajuluxel.pdfIn PDF document text
    • http://topstudy.fun/wigesevakufopisotuxuwpk9ay.pdfIn PDF document text
    • http://max-lifting.store/the_spoke_zarathustra_summary5hw6d.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/leludamej.pdfIn PDF document text
    • https://muwilumi.weebly.com/uploads/1/3/0/8/130813533/juxisixirot_gumimikopifel.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/9638917.pdfIn PDF document text
    • http://copyrightshelpscenters.com/x1_remote_codes_for_cable_box8y7ka.pdfIn PDF document text
    • https://zasubimivari.weebly.com/uploads/1/3/1/3/131383839/7438548.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/26af01e8.pdfIn PDF document text
    • https://jirewolekaza.weebly.com/uploads/1/3/4/3/134387643/798564.pdfIn PDF document text
    • https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/noxikib_kagoputu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d131ef8a34de4836b0d110623546332c.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_c8997624535143eaa6f3bc49637982f3.pdf?index=trueIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_9e6785cd43bc426aa8020b8bcedf6e45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07320f1-9e6e-442b-8e9f-bfd528270390/dialectical_behavior_therapy_treating_borderline_personality_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3206177-6a66-496e-a3f4-43c94de3ad4d/lunadapuju.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/therapy_interfering_behaviors_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f916708-2313-43c1-98d5-04b971ca906d/74062737040.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/16258284084.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_3b858cbe79684291b68d2e2f04cf4daf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a269ec4-1044-469d-af95-adc0a237d3bb/percy_jackson_the_lightning_thief_book_vs_movie.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001b300.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B300 30608 bytes
SHA-256: 91968ec226f2ebbd64f74d61a35d7d225b2fdced76378977ba68e9407ad5c8a3
font_00_sfnt_off000172e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E4 5268 bytes
SHA-256: 5bf20558999316f16a2c50a998cb61204e59646e117c9c8107f62d3a6861c8dc
font_01_sfnt_off000184c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C9 15752 bytes
SHA-256: a668d10075f224975d1719a2e58647cbda34274a06c9708dad7b00ea6d3c9711