Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b1d5d2171e4914…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 012e42034cbf9705d88bd86f64836156 SHA-1: d5feebcb46187e46a2d1d2d81c15719327458eb8 SHA-256: b1b1d5d2171e49146ea57ed83aeaf696bd5da008b06a4ec3eb4926b1c1f4a891
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm, containing a large number of external links pointing to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a phishing or content distribution scheme, likely initiated via spearphishing.

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://xezojetit.ru/wix?keyword=4.1+skills+practice+answer+key PDF link annotation
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/demaxenevebule.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/kakofedavavorejojuzobote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff75d45f3b5f.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/kivef-sewiwan.pdfIn PDF document text
    • http://mapenibo.scienceontheweb.net/constant_current_coulometry.pdfIn PDF document text
    • https://pisaloxonuk.weebly.com/uploads/1/3/4/3/134391291/lanupugolesawaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_60517e36908f0.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/71934258946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_60446aa7c371a.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/zuxitobube.pdfIn PDF document text
    • http://zitosuganenat.medianewsonline.com/fagopidokiganebumaref.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/xiloketabul_vudufamotosi_bajunow_fanoxegejamupa.pdfIn PDF document text
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/2c25f77af.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/25422474039.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/fantastic_mr_fox_full_movie_stream.pdfIn PDF document text
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/9d60987ebc86.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/0a3621dbe7df38.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/1386732521.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/voxulija/nipimiroto.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/37188438069.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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5260 bytes
SHA-256: 41362db22d0ab45be8833ac5253bd7b835d3248b672f86d3b92eb49ce3b5c929
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 11136 bytes
SHA-256: a70395ac2b61e4e2fcd98ce4bacbec8ec9566c354c077016e8ec948d8dd4e59e

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