Malicious PDF — malware analysis report

Static analysis result for SHA-256 af83a0fad2933a30…

MALICIOUS

PDF

87.4 KB Created: 2021-06-01 16:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5ed0fdc1fbbff9c5fc3d79c37d50858b SHA-1: 40da38213afea818a71d03f0442d8926a817e899 SHA-256: af83a0fad2933a30ed1cd8f6d9c5826b9d82ca63d0b0a419565798c5770e9a25
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The primary URL, 'https://wastran.ru/pbw?utm_term=how+to+connect+airpods+pro+on+android', is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/pbw?utm_term=how+to+connect+airpods+pro+on+android PDF link annotation
    • https://sasenepekevob.weebly.com/uploads/1/3/4/2/134266747/301a776e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff8aa827f250.pdfIn PDF document text
    • https://tewutenuka.weebly.com/uploads/1/3/2/6/132695339/6360025.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/rebulu_vobosasexe_nobogotatu_lokikubop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_605ff87dc5adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ff7735ce6f2a.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/1512772.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/5cda76ad42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_602194306d8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5fd771912851c.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/0276fd447e.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/6070966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_6007d0cd6502e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460070/normal_60b1ad08bfb12.pdfIn PDF document text
    • https://fowemofuf.weebly.com/uploads/1/3/1/3/131379389/3eee29.pdfIn PDF document text
    • https://vusuneroroloxik.weebly.com/uploads/1/3/4/0/134096702/nugabajaguj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eaa5ece-47f1-42d9-81e1-2e34c0bd3c4d/59374102511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8ab36d-3e6f-4834-a82b-d820774f7df1/60782357943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4670340e-b9d5-4039-9a7e-78aa0bf5f7f1/aswb_clinical_study_guide.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 6424 bytes
SHA-256: 4455747fda9ac97410526ac3fee3ca643cc61cb592146befb7df79af2604d95b
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 5088 bytes
SHA-256: b70118cea4b664123df4fb96376daefbac1bec5d88d0af51d2f901a61d6ac132
font_02_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 1940 bytes
SHA-256: 1c6ba7332e038ebc7b198ea9eb87a44ea1652f134df48d751f3aacc0c6303f00
font_03_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 10556 bytes
SHA-256: a6bfb4f19965396f8da6fbbd3e6a70d43441239086e213a31e3e9b1f9c7d7924
font_04_sfnt_off00013932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13932 16324 bytes
SHA-256: 50ae14fed270b2022073df0f8a3b2f64cc910466f23e997e2d259baa79160da9

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