Malicious PDF — malware analysis report

Static analysis result for SHA-256 152d5dbbb8d934ea…

MALICIOUS

PDF

75.8 KB Created: 2021-03-12 21:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 29b5fe08e2a76835fb1385e97a427ee5 SHA-1: f43e878e82548a68ae0da9101b4dd99c5c7f4a7a SHA-256: 152d5dbbb8d934ead1dfef756746256a9c2cfb19394b5ffcf1d37b6431951e00
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for brand-impersonation credential phishing, specifically impersonating Chase Bank. It includes multiple external links, with one pointing to a redirector that ultimately leads to a phishing form. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to Chase and authorization forms, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/5109618.pdf.
  • 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/123?utm_term=chase+non+borrower+credit+authorization+form PDF link annotation
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/5109618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5fdebf69abb54.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/5306f8d78c59bd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5ff36c07433d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_60323c5515516.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/fagit.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/0d66566b3191.pdfIn PDF document text
    • https://raparugatefovax.weebly.com/uploads/1/3/4/3/134361383/tumivuwagikekuxovuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_6014295ce849c.pdfIn PDF document text
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/6265073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_6025b54666834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/james_conner_steelers_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/sainik_school_ghorakhal_entrance_exam_form.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_2ce8b01ac3bc4c759490f6f05b53579e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6789544-b82b-464d-8cd7-387cf4dd51b4/rimiwamukix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38f8732-f535-4a83-b984-b23280ba427d/jasakijujogemarumaweduv.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/geladit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df8c08-c473-47cf-b6dd-70f61e51a71d/mivada.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_a21e2be3b0a54d27b186787ecf0dc0f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/welararovikisuxogu.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_ff8dbb92ca47439a91636f7aaaa83327.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_44eddedf7ff749baac9f510b73fda432.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_91fc81879c364eedb49234ef36cb2bdb.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_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 5416 bytes
SHA-256: df6596d817aeaf03c5ec4efb0cdabd1b494c4a8d3fce5fe653d7d6d7205e9335
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10864 bytes
SHA-256: 4f49426aebd11a0102c0caf9a67beb7500e9ecda20839241dc8af800906400b6

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