Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade40c156a15f91d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-19 21:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e0216256b827971e235e7fc891ba62e8 SHA-1: 2eed8b4e1bb38c2a1c7faa1c461b3ff9f3a03e85 SHA-256: ade40c156a15f91d89af9235e8fa72fca6290d463bda9710b1741008f0b912f3
186 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. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/award?keyword=integration+formulas+pdf+for+diploma PDF link annotation
    • https://bemaxeviliw.weebly.com/uploads/1/3/4/4/134482954/bupefodipejelonin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_5ffe0466e05d6.pdfIn PDF document text
    • http://reduslim-shopofficial.site/komibubatodimupaterostniq1.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/how_do_you_apply_for_the_chick_fil_a_scholarship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407302/normal_5fc7306dcb346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375884/normal_5feb584b1a6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_60415a6415328.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/dewibujoratogopafidiwo.pdfIn PDF document text
    • http://maselawave.22web.org/rivirusalomakegezanukud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_60453b4d02af4.pdfIn PDF document text
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/lazinujifowari.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/453647.pdfIn PDF document text
    • http://disozire.mygamesonline.org/dixujemolad.pdfIn PDF document text
    • http://freehookup.xyz/landline_telemetry_systemezdkl.pdfIn PDF document text
    • http://lunesygets.xyz/globe_mybusiness_prepaid_internet5gq16.pdfIn PDF document text
    • http://fsbsiod.com/gumshuda_song_download30zao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_81cbc556686946de98669b41cf261004.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_10db6e1d6fc447b991c4abc8efe2baf1.pdf?index=trueIn PDF document text
    • http://newiropi.epizy.com/57331222279.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_fd187f6145764263b84ea27b34790fc4.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_5b8731dccb564e1fa5c3d6e6624e58bb.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/why_is_my_duraflame_heater_beeping.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_9023c2c3a1a1467c87ca74da9d4825c7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 5296 bytes
SHA-256: 77d3a06027b9478c4c63b2db5010da92b067231c525accd857c0b7f7a343a9ab
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 11628 bytes
SHA-256: 94f4f4b0c0c9c1d1a25f5d6b78344bd0366fd4c2e8601b4810871f8edf1b435e