Malicious PDF — malware analysis report

Static analysis result for SHA-256 826f3413c75f07b9…

MALICIOUS

PDF

78.4 KB Created: 2021-02-14 17:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5915d8daff3a7647ee5b3eb9e3f4863e SHA-1: 2dadc6462ca8b7600ed098dcc7abf05a60d321f5 SHA-256: 826f3413c75f07b9d56e163d8aec758fbcaea1c190d020d92fe9a96f017fbc7b
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to 'wine making for beginners pdf'. The ML classifier and ClamAV detection strongly support a malicious classification. The primary attack vector is likely spearphishing attachment, leading to a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=wine+making+for+beginners+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_6014844d0ab4d.pdfIn PDF document text
    • https://cdn.sqhk.co/bewagolene/ibLAgho/welcome_to_the_future_lyrics_trials_fusion.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/xulurilo.pdfIn PDF document text
    • http://jikitosot.22web.org/48708019484.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/3272961.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/kapaxikev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fc998074f1f0.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/4tjjih7/ballinger_memorial_hospital_cfo.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/jfie76j/kingdom_business_fellowship_bismarck_nd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601baf43923d2.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/safenalavojuwu/barishan_rico_song.pdfIn PDF document text
    • http://pisobak.epizy.com/zuxefovenibesumipu.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/jatenipupumadagafuko.pdfIn PDF document text
    • http://lugirike.epizy.com/celine_dion_songs_mp4.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/64209454572.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/94741682109.pdfIn PDF document text
    • http://jojerigexorow.epizy.com/essential_actionscript_3._0.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/video_show_pro_old_version_apk.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/mujiwi.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_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 5548 bytes
SHA-256: 7ad2303a8f28a1c0e47aa91d18323eae1a95c1de0da640c969d41ee8eb1202d8
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10852 bytes
SHA-256: bd510ac364377650ad043048729296c288ba3ec2be2ce98459703e7adee048d5

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