Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c6e906d71af9dc…

MALICIOUS

PDF

97.2 KB Created: 2021-03-06 02:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d18f89524ce12c7ae8ea0f5d473328f SHA-1: 28fde61bdb42a9bb2fac337ce70cc622b846a7e3 SHA-256: a8c6e906d71af9dc03176862bd1ffecbe53325f5ccaefb9b77b3598ba98b3e59
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with at least 30 links pointing to other PDFs, suggesting it functions as a link farm to distribute malicious content or phish users. The primary malicious URL identified is https://soxebez.ru/wix?keyword=wemo+smart+switch+manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=wemo+smart+switch+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375698/normal_6040a40ae47a5.pdfIn PDF document text
    • http://shoop-fg.ru/keyboarding_proofreading_marks_worksheetsj52u3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60302feedd34f.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/3f485cf64d19d.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/joparuwuwub-xovot-mubofovaputuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6036ba44edc1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_6039ea2d35745.pdfIn PDF document text
    • http://domavera.ru/binizoxotumugametogd4pl.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/sijevokomadolese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_6001baffad91c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_d97eca633c1340908229f11b261582cc.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_8044e46a1d8a4c13b0168907ecdce9e4.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_539e5a3165634f64b96e754d2ce6cfac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52665406-e8c4-462a-9bd6-669cd51a710c/97434934298.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_31bce19397074192bdc88bf4d6d41078.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/wwe_summerslam_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/bass_booster_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ac0413-da01-44c7-a285-678050f52dce/xateputu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001417f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417F 5144 bytes
SHA-256: a03c0e6b19c87b4a25903beb16f94226275725c875d3a3e2ae276ff0588c8480
font_01_sfnt_off000152e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E7 11088 bytes
SHA-256: e60f6504f372d0b94f3456983ae10f3edc9fb8bd7a03262917207af472ded257

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