Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a590448d490d05…

MALICIOUS

PDF

75.0 KB Created: 2021-05-07 00:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 43e7c71e6c1f87e410d37ab377332235 SHA-1: 0b2a23681f227dd9dbf361e3df7ed6f72ee00e73 SHA-256: a7a590448d490d05b20ad466a2113878db57f86278d292c7a95560466e717600
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to redirectors or SEO farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=how+much+are+trampolines+on+amazon PDF link annotation
    • https://cdn.sqhk.co/lunapolakezo/eqhhnNt/2020_kawasaki_ninja_400_dashboard.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/hdWCPgf/43793161578.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/garewumezofiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/5bjggg1/68359655313.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/cRgcja5/call_of_mini_zombies_hack_2020.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/c8778be.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/fe11c2385f336.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/yidhdjr/kiku_sharda_father.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d0a8ad-220a-4111-84ca-b82da5f59856/20772300168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd2e19d-601e-4ae8-a077-f502e0903d15/72947608179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78a3137-40fc-4705-99ec-5dbebd52294d/the_attack_yasmina_khadra_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196a8f02-6959-4857-8097-2c1362f9446d/budoxafemixopaxanatetodis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9223a7-9c82-4926-b4d4-1d4123e4551a/laponitanelajupuf.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_f4388c45bc8548b2816d3ff15f0dcac4.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_c72afc2c3522438faf88b4a58fed9989.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/513f106d-24b1-459b-949d-545151ed9969/nagisobexowowokudes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece41d4b-8627-4bd3-b3d6-a5b8d9d335d4/45157921192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e407ff-e07f-4e4b-ae03-d0b50769f913/who_used_guerrilla_warfare_first.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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 5276 bytes
SHA-256: af6cb9b893be3b15684cfc64e14849cbbb51ee4cd7eaa2541a1f6aec5d32f820
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 10888 bytes
SHA-256: e4414668e416a78026a1b8374e8cf7a9dfed89e06251f88280338c0673fe6e17