Malicious PDF — malware analysis report

Static analysis result for SHA-256 a978ff1a43b3ee9d…

MALICIOUS

PDF

100.3 KB Created: 2021-03-14 04:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e5cd119bbb8dbd50eb477ef2c397be5 SHA-1: 3c3870751d61ef115dd48947d02b3adefa331c01 SHA-256: a978ff1a43b3ee9d4ce12c07176859fc03be987e3e49b9781398f077a45ff352
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://pelibifir.ru/wix?keyword=wow+guardian+druid+m%252B+guide PDF link annotation
    • https://tetuxexe.weebly.com/uploads/1/3/1/8/131871535/zolafejozuxeko.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/gigava.pdfIn PDF document text
    • http://fherixq.com/a_writers_reference_onlinegumd2.pdfIn PDF document text
    • http://axecheat5.xyz/nutobidepalarelijn3z9p.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/nivawepojulawesenelupiba.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/rewipafazexuvux.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/bloons_tower_defence_5_towers_guidepsk8m.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://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_94b8e238736d413f9be12e340847d6d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/100s_chart_fill_in_the_blank.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_03649fc298034caf81f9cbebb9b94c38.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_75a9105e81fd4847bb219e978121b6d4.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_64189c2905fe472d93e147b779091a17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/balancing_sums_worksheet_ks2.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_8f12aa5dc23543baaa2fd441bf398034.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_82fd584d842642ee83e3c24aa76be938.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e9730a6b085448a1b2d8724083baaca0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/delmarvalife_holiday_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/66439296685.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_b2a1cba299014d1db808327a221facfd.pdf?index=trueIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/mekejaf.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/84100386866.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_0cb820b2d2424b4aa4d87f80f8010fc5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 4844 bytes
SHA-256: a2a699f48a91879135678bac2cfd21a42855f60216fb8852ec2628ad6b5374ca
font_01_sfnt_off00013a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A50 10868 bytes
SHA-256: b74dc654c5a2ba605046ac0fbb49363a03456b39484332c52471614adbf2a12e
font_02_sfnt_off00015f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F78 16400 bytes
SHA-256: 1e0579a9c7f603c78c49675f39ee6290204a4650b0b09f6296c3741c1b5b6830
font_03_sfnt_off00017584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17584 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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