Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fb6e4183880a89…

MALICIOUS

PDF

81.6 KB Created: 2021-03-21 01:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e0b539d6ae75c42df2a32b7c6cf01ac4 SHA-1: aeac027b87930f33bb86952ec646ca519455daa2 SHA-256: 77fb6e4183880a8954cfeded71b2103229e899a9dfdd9f9c0671ac331500bcf3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a tactic to manipulate search engine rankings or distribute content. The presence of a malicious ML classification and ClamAV detection, along with the embedded URL pointing to zajinet.ru, strongly indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://zajinet.ru/123?utm_term=anticipation+guide+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423428/normal_60313385dc07a.pdfIn PDF document text
    • http://roflan.site/sony_bravia_32_inch_smart_tv_manualmy69d.pdfIn PDF document text
    • http://prodson.space/sakutikogatuvoromeboby1py.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hdheHif/wwe_news_smackdown_grades.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/O8Rjjf9/41031916713.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/fhd0Xig/30759797755.pdfIn PDF document text
    • http://ritual-venki.online/108_mudras_in_tamilwuinx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_60091c787125e.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/mDifzzo/iron_wire_wine_bottle_holder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_604672f41fc56.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/ieYhigd/amino_for_clash_royale_fansite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5fcbc8f4f03a0.pdfIn PDF document text
    • http://sevastopol.sale/easy_crochet_patterns_for_beginners_tutorialuvs4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366327/normal_5fdef956c45dc.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/mubefula/tissot_1853_t_touch_classic_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/vixaf.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_af117f1776f54d9ebdbeb1daf0c4a31f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/95997625437.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_52b2b2dd7edd4aaebe776d6d0d6171b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/fevixobowelazexumeku.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/zaperotajuze.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/adenomatoid_odontogenic_tumor.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/weguwegupomas.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/avengers_assemble_all_episodes.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
    • 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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 5288 bytes
SHA-256: bd4cbbccc3ded946f4216a4f2d4ab893543850b88b1594f11dfdfb06ad1fcf9e
font_01_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10856 bytes
SHA-256: 4d849299eddc1f1d12991c816acbbe6cc8ccb5805d5da050abce1571faccda50
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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