Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6218767b7af7f1f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-14 07:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 98de1b7c72c26ab0b862fac417be25e0 SHA-1: 6cb06e65d4702cdf441d44c49a97646578e0b7d2 SHA-256: d6218767b7af7f1f2e71818fa79b3d5fc21c08ba431d35f458c2a3d5a240b4f2
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates at least one link directs to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=jack%2527s+lost+help+jack+find+his+home+tricky In PDF document text
    • https://lodipopigib.weebly.com/uploads/1/3/1/8/131857338/pafitor.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/fdb55135f.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/favuwejanetid_fujife.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/sHPiaie/kapomajad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fd381ae14a9a.pdfIn PDF document text
    • https://demozopadusil.weebly.com/uploads/1/3/2/8/132816094/fosopaxunenape_julimila_bobugawi.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/iaa7iaj/sekikitevawufo.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/ritusa_xilewadoboreru_nowaxawapu_xovezeku.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/317919.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/xagofamojoriz-pokorefemini-zujiluze-kulijeragapuro.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/d723d9d6dcd4.pdfIn PDF document text
    • https://fabexitib.weebly.com/uploads/1/3/4/1/134109013/kaludabepixexifin.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/pOQIzjc/dezujesinitugen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5ff64a1219342.pdfIn PDF document text
    • https://wapifonobuj.weebly.com/uploads/1/3/4/7/134744781/kozebimudov_pufuwo_nixelesawuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/omicUgy/hitman_reborn_tsuna_and_haru.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/bidgfgd/baking_dessert_recipes_from_scratch.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/pusixa/southwest_airlines_app_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/53873587183.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_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 5660 bytes
SHA-256: fb7599f1c799022522ec6f86f659ba8f49c1fc04a200cdb45d4e0c4833d8d3ba
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 10356 bytes
SHA-256: c2c811c7467ec62254b9c46a1a0c398ae702cf2ada9af942ab6744c60d126d1d