Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65ba2575cd56b96…

MALICIOUS

PDF

79.6 KB Created: 2021-03-07 07:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe0d4336aea2558135121ce6cdf7d44 SHA-1: 1956e40d9bef81675427d308890f181137532073 SHA-256: b65ba2575cd56b9613e89ff06d928f7729ed8d42a16b0b33c70f6658853cd310
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to fixing a gas oven pilot light, which is likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=how+to+fix+gas+oven+pilot+light
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5feb9b1935e7c.pdf
    • https://static.s123-cdn-static.com/uploads/4491410/normal_5fc9996804db8.pdf
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/lofevazikam.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_60194ed57c775.pdf
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/dexelitaponikitugem.pdf
    • https://jesakejijubew.weebly.com/uploads/1/3/4/5/134577011/119663f.pdf
    • http://pesale.pro/who_played_the_elephant_man_in_the_1980_movie31utg.pdf
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/f42e35b.pdf
    • http://lishop.site/balancing_equations_worksheet_3_answers04qke.pdf
    • http://azorocheat1.xyz/arcademic_skill_builders_math_gamesyqju4.pdf
    • http://parkji5x.xyz/salalominisagjdkj.pdf
    • http://3203epworthcres.com/931620023507jmzw.pdf
    • http://parkingtest.xyz/how_to_lose_weight_without_working_out_or_eating_healthy1g5m7.pdf
    • http://vekvelo.ru/75675284598wqv9c.pdf
    • http://premiumpornclips.com/616552679717bk73.pdf
    • https://cdn-cms.f-static.net/uploads/4378834/normal_601eeaab87beb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_ee2c08594518436a81f73e8479bf46c5.pdf?index=true
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_540fdefb7a6042a095b2ade35de129d7.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_7d961ff355eb4945871071c9af2fd287.pdf?index=true
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_564c893aaa1f4037936a5e97ec6e7c19.pdf?index=true
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_502899832a284c909758772ee0d4e4b7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4e.bin
d2325f9ab0f02c88af17921aee478ec0dd9faecfddafd17d340a9e8d2328fc62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 5248 bytes
font_01_sfnt_off00010e4c.bin
f542c4028d122188bc30267867ae5beec10b4967fb8c801e4a266a6eb0b1f29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10240 bytes

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