Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bb1875251f8e54…

MALICIOUS

PDF

90.8 KB Created: 2020-12-27 11:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25e13a3915bee61674e5458c2f2b693a SHA-1: 7c16bcd30a8f39ee6b2f1792a3f850c4a69c218b SHA-256: 76bb1875251f8e5481befecdd71c505b544a93d5f181762a026d0eace5f0d12a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body text mentions "fake prank call app apk", aligning with a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trafffi.ru/strik?utm_term=fake+prank+call+app+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5fdeb3e392e7e.pdfIn PDF document text
    • https://fukubumo.weebly.com/uploads/1/3/4/0/134016705/vojibuputavosavuxit.pdfIn PDF document text
    • https://lodejudimawepum.weebly.com/uploads/1/3/4/3/134350935/5876770.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/9062859.pdfIn PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/6201661.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/349931.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/8e6fd5626ff34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477620/normal_5fbede6a25864.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/ec335a1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5f981ef710158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5fbd72257be18.pdfIn PDF document text
    • https://xexogabowagub.weebly.com/uploads/1/3/4/4/134438270/efd5292c7a2.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/5dead4c09b9.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/xasizexowosironitoro.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://s3.amazonaws.com/vuzotisenixava/28230772738.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/ceiling_design_hd_images_free.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 4316 bytes
SHA-256: ae1771b4e1dc58584ee6f3ba612adad77427bc20f41c9c1f72e5baae260855b7
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 4560 bytes
SHA-256: 44590a3e449c2e755078e4dc8ce041ecd07155a1d339e09f417fe789c5aec959
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10836 bytes
SHA-256: db8afe2c657f3a1c02a328111c8e9fcbf544b84f8e1762d982217e9321679b98
font_03_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 16908 bytes
SHA-256: 188e0eea854d886bf96ae85773d1a5a014b3559da53759183bfc7b5e5ee49daa
font_04_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176