Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9dfebb8c279f18…

MALICIOUS

PDF

91.0 KB Created: 2021-03-12 02:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5a8031c5488e5daf3622e06c21be8c2e SHA-1: 067b9587217b40e88466d477aacd268a5e197eaf SHA-256: aa9dfebb8c279f18ac36d9dd39e8bea61bac61a8699bcdf67538ee6436832788
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_LINK_FARM' specifically points to a large number of external links within the document, and the presence of a 'utm_term' parameter in one of the URLs indicates tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=video+er+app+from+any+website PDF link annotation
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/zasevetomigenaw_lotilulib_woginuzoji_xupelivexobi.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/iQPFE0m/zombicide_board_game_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/idgdGxN/59528838179.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/6452762.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/gjgXjiU/52344766089.pdfIn PDF document text
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/lubetipagutegusa.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/deterirokadobotokipipunkg7qy.pdfIn PDF document text
    • http://giocodigital.website/67605302313bt8l9.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/nmsGjcg/1574235994.pdfIn PDF document text
    • https://xemudimiju.weebly.com/uploads/1/3/4/8/134861016/8320183.pdfIn PDF document text
    • https://bididanigatozum.weebly.com/uploads/1/3/4/3/134314142/1951337.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/ggZYbhj/sanikejajox.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/363f2c433.pdfIn PDF document text
    • http://proita.space/97299240166eyo6f.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/1367.pdfIn PDF document text
    • https://cdn.sqhk.co/toruwapelot/4Bihojh/zoology_dictionary_english_to_tamil_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/l3pi9ih/8202760853.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/qhjiggf/knife_smash_hits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_29d4f0c139ec4a52901c503029e0770b.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_e06889e0a99c4db1a51b2965afbb6b9f.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_5a79728c6eb94898a88a06ea186bd469.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_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 5456 bytes
SHA-256: 6127ceda31bce02f56d37680aa66f8af95ae5c7b22e4d0e231f0e56c9302ad4c
font_01_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 11180 bytes
SHA-256: bb1e60f12860440d65f0b8ce1c63007b8f4f5ccd1df32bc0c913264194d32f35