Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5441bb3490a2053…

MALICIOUS

PDF

88.5 KB Created: 2021-03-15 11:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98ed641a42b751149b00064310309df4 SHA-1: 1ec753f761b81371475d9543676cb1d7c144090a SHA-256: a5441bb3490a20537bfad9f1d26db31195be585aed38efa9b33f2ac4c0ff454c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://dugedepap.ru/strik?utm_term=1+unze+gold+australian+lunar+iii+maus+2020+pp
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/wejikowudojaxuzob.pdf
    • http://bosnoslovnoejelaniekupit.xyz/answer_key_2019_upsc_csat2qpcr.pdf
    • http://form-lnstagramcopyrightservices.com/33186284676j9ibf.pdf
    • https://static.s123-cdn-static.com/uploads/4403540/normal_5fff46af531b2.pdf
    • http://livethailand.fun/lagu_boyolali_kota_susuzz3hc.pdf
    • http://xtw2.club/tobevanu3poz9.pdf
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/giwesizukudo-pinepu.pdf
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5ffb7f2137e72.pdf
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fd34f2cd82fa.pdf
    • https://cdn-cms.f-static.net/uploads/4467278/normal_6049156792c35.pdf
    • http://makamar.tech/1718680204300jt7.pdf
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5fe36131be4ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6c89517-b823-45a5-9593-35d36344db17/irobot_900_series_roomba_960_reviews.pdf
    • https://uploads.strikinglycdn.com/files/fd726bd8-a89d-4a04-aef9-20c727e39931/cuisinart_-_coffee_center_12-cup_coffee_maker_with_water_filtration_-_black_stainless.pdf
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_135426b944984893a1f960a583cdc5fe.pdf?index=true
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_697f24044d194ecf82854494df04b512.pdf?index=true
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_4060e1172d72453a92df5e8a464adf69.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_eacb096a1eb24d45ab359eb97c8f9081.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0554a33b-a1e6-4606-9cc5-f53007b0d0ae/cortisone_shot_acne_midtown_nyc.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_78f4687d236c4bf98e76752ca8f7daa5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91ede10b-2cca-46cd-87b8-28cc717f5187/rugobokufanajebovibu.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_75de7ce2e7074208a4f3667fd2b8acff.pdf?index=true
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_b9b7d7dc318648308ea5f6665bed8beb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011879.bin
8617b2a35e29bbadee1fb1a6dccd3192bbff63a6414bf705b313af579a576c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 5560 bytes
font_01_sfnt_off00012b52.bin
4bfb066d1a094bebc833fba032f1eb140d78da1d085887a00d552910936a1231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 11688 bytes

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