Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7707b88a9373c06…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 01:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 92ebae5462d98fc7e21919d9b76d6ce0 SHA-1: bf8d464022267beab37856ba753a8155e40068e7 SHA-256: c7707b88a9373c0673416131d568cc412fe03c70fcc048346f23284e6f8d8d30
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=nuwave+2+manual PDF link annotation
    • https://cdn.sqhk.co/nadipozow/9niexTD/30706177852.pdfIn PDF document text
    • http://fasusugexewi.22web.org/fiduwetafujejikowugawidi.pdfIn PDF document text
    • http://vatosake.iblogger.org/9841646524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_603e0915ceed7.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/83724734818.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/vocabulary_workshop_level_f_unit_7_completing_the_sentence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_604e889be1dd3.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/how_to_use_an_architectural_scale_ruler_1_8.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/513225aae3e48b.pdfIn PDF document text
    • http://gonugotez.22web.org/android_graphics_card_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5ff76b209e8bc.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/jjb6bug/tujoxagafuvimuma.pdfIn PDF document text
    • https://tisikifa.weebly.com/uploads/1/3/4/6/134614219/jeneraxenegiteva.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/palevijuj/74389339212.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/beech_a36_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/football_prediction_app_apk.pdfIn PDF document text
    • http://kebowikosu.epizy.com/60630637893.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/cisco_umbrella_datasheet.pdfIn PDF document text
    • http://lojagajojib.rf.gd/34454150255.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/2105863467.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/black_3d_background_free.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 4812 bytes
SHA-256: 70e452ebd9f119996b6ee54fbf6026fd43ee8c541cfe50c1dfce0edc1e2f7992
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 11228 bytes
SHA-256: 1be1ea3b746237874ddd6d6e9bd9253ee5483f4a27ffef486269d5e3a35c91e7

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