Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55b00a8fec3954c…

MALICIOUS

PDF

81.7 KB Created: 2021-04-01 10:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3ae933ed4c76948020db1959ca168062 SHA-1: 3357ca45e3fdb27a05dfc4f957eb74d53eac3a98 SHA-256: f55b00a8fec3954c1e21841dd31be69402b5bb43188e233e65a70a1e0ae24aa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a high likelihood of distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://jumiwimov.ru/wix?keyword=max+vandenburg+actor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469126/normal_60432b8cc89cd.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/0f4c6b.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/XtiejdS/dark_angel_season_1_episode_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/9iddifb/10498321309.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/cA5vPgz/vewobokisu.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/kejomoro-jolafa-jepitevoj.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/8jgFjec/vintage_drum_kit_for_sale_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/kMoihjb/cooking_fever_game_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/jbheIjc/swing_trading_course_free.pdfIn PDF document text
    • https://bawezinanowele.weebly.com/uploads/1/3/4/3/134305895/1845491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_602c24cb4c68e.pdfIn PDF document text
    • https://cdn.sqhk.co/kurazagizub/jTNIDFN/stokke_tripp_trapp_harness_cleaning.pdfIn PDF document text
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/6f1f2.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/fgfqjgT/crowder_college_blackboard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601b7e2c4a93e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff90163c4ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_603d10b8a0dbf.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://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_03576af69db04b438078a6a865b49dd3.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_2b005fdda8c94c3f9d1a2f8059c75691.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/b_format_ambisonics.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/gufodapowo.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/conditional_formatting_highlight_duplicates_google_sheets.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_e65aacd11ce94b558511b2ecfae263eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/wivumofavuxabexem.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_a27256eb323e4eae98ee6ce8d5a47e12.pdf?index=trueIn 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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 5004 bytes
SHA-256: 7ffad300c4db5da06b300ee039dbada165249fca6ce396642bbae4f2c6913aae
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 10724 bytes
SHA-256: 0814d7c680224902c5cca9396d9a697c23028433a269ef86f408ba9eb454e525
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3