Malicious PDF — malware analysis report

Static analysis result for SHA-256 740fa3f9db993d7e…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 13:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c90e134f4eb0728ffc6a024845109bdd SHA-1: 5355a544e9b9ac1acfb8dd742cd2c248dd9f8321 SHA-256: 740fa3f9db993d7ee379e70dd99ac65b361e735d621ef89f38412a46b564f9fd
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 0.9954

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://golowaki.ru/123?utm_term=no+way+shape+or+form+origin PDF link annotation
    • http://save50.pro/sixilazulonc291.pdfIn PDF document text
    • https://sojexima.weebly.com/uploads/1/3/4/5/134584898/6090637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465262/normal_600a0e4f88d9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fcb49b19e05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_60203486b6ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_601d82f7acf19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_604405c8cf9c7.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/gurege_xijaretipemo_jorore.pdfIn PDF document text
    • http://girlita.space/56882020889kll1b.pdfIn PDF document text
    • http://obzorov.site/how_to_resist_interrogation_techniques5omm8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_60369579290c4.pdfIn PDF document text
    • http://redit.fun/sony_hdr-as200vr_testanc8n.pdfIn PDF document text
    • http://hurleyshamburgers.com/silajasitafiponutoj0uty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_604ef8dd4ffc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_60629ab6de8f0.pdfIn PDF document text
    • https://pizanege.weebly.com/uploads/1/3/5/3/135391653/d66583f596b2bd.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/jopeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1aa3b32-20a9-4420-90b7-7a7a5a24bac0/the_silence_of_the_lambs_2_gary_oldman.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_a90364073e1243c9a6ec7fe2982e91cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a937e27d-07d0-4b33-bc65-976b12b8b999/30535361025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cb9006-8690-42e3-a9bb-d66d6470ca52/how_to_day_trade_crypto_for_a_living.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6181d74-799b-450f-8d34-7dc6cfe614b0/john_deere_x320_snowblower_attachment.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_6984c99840e8431dbbaac89fd4203087.pdf?index=trueIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_c5dbbb4bad8d45fcb664511c9b14bda6.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_962e3cb37c4a44f68db2ff387b6cc14d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a432b8-0824-4c66-8287-edb0367c9092/what_is_my_lg_tv_code.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5448 bytes
SHA-256: 6ffe61f273965c754e0b0add8dfcbb7c989acf9b7a45617056e86ffd38e69999
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 6664 bytes
SHA-256: 45f8315503a561eb7d65c1ac01289cf56488475696238c523307d264318450e8
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 11224 bytes
SHA-256: 1d881495b60c6405042bca376f92ec036cc3b34297bc6d88cf89b04e14276a16