Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ca16fb634a8041…

MALICIOUS

PDF

81.6 KB Created: 2021-03-19 13:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a2fbd4193c55a5a201a83f4382bac78a SHA-1: ee20f972a984e60a4937cb65f8f65e81e41b0a1a SHA-256: a0ca16fb634a8041d5272f58bd38edf30485814ac99834b6ab709a582d7eff40
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a mechanism for delivering further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/award?keyword=rti+application+form+pdf+punjab PDF link annotation
    • https://bamupenasod.weebly.com/uploads/1/3/1/4/131410012/lazojedove_nelaleninaxop.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/ejbghgj/capital_fm_radio_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/edUicid/larinobekasud.pdfIn PDF document text
    • http://giocodigital.space/29799030569t8fk4.pdfIn PDF document text
    • http://gratoramaa.website/vadewewowelamapixuwuwejuvv3b0h.pdfIn PDF document text
    • https://cdn.sqhk.co/nonagidux/VhcIJ54/59186841696.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/u7vhh83/cuba_travel_advisory_covid-_19.pdfIn PDF document text
    • https://jerijumewatopod.weebly.com/uploads/1/3/5/3/135330781/8292980495b62f.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/wuzaxobuloduz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470678/normal_60035482a0c87.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/6ieWiiD/person_who_answers_911_calls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5ff3cd93dba72.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/5353b001839392f.pdfIn PDF document text
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/niwegizabatezil_zemokimumiw_winuterupuzup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_ad7cde6057b14e18a1520c6334468331.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_ba900cccc2bb4113b8b10d96023f3ae5.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_0dd2a1e92aac467bb48daae1baf1ea69.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_27863905ae1f493ba7feb89bb29a46e7.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_aeda5e7c1e1f4d5f970820a939a7d039.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_f37ce32df89a4b62a2a0b0cb33244de0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5348 bytes
SHA-256: 5557f09b5c53be62f0fb8bf561bc6ef252a4cb5d665c1d7e7e573caaaebab2ac
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10476 bytes
SHA-256: f7ec2b66757c1a1c7c5629ba6c7c649dfe9ca938244768686ac97edde6e77be3
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16172 bytes
SHA-256: 6e699eab9a6fef16b3ea923df7b93ce1c5cbd97c7a594d359cd98c90be4a35f1

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