Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ae80d4aae304c1…

MALICIOUS

PDF

83.0 KB Created: 2021-03-03 05:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d389e6883575d17cb2b4cb17df06adc9 SHA-1: b19fd4d3db8f43f3804a7231274f193aae4c06c9 SHA-256: 81ae80d4aae304c1571b86e47d52241675e785fa11c1301555b0832331400a2d
184 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting and another identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume and nature of the links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=football+exercises+for+4+year+olds In PDF document text
    • http://a1metromovers.com/308841375060d2e4.pdfIn PDF document text
    • http://albl.ru/the_happytime_murders_torrent_downlo9frt9.pdfIn PDF document text
    • https://juzuxadubibipa.weebly.com/uploads/1/3/4/6/134685448/rejelibafunifi.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/asus_rt-ac66u_router_problems.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/0e99c1c3dc82.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/ribegif-wuwunorukurofi-ketuwagaxug-jaremimefuzef.pdfIn PDF document text
    • http://hurleyshamburgers.com/keystone_kstad70b_70_pt._dehumidifier_canada2nzq4.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/frigidaire_mini_fridge_retro_6_can.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/zopavetas.pdfIn PDF document text
    • http://adr-media.work/bowling_xmas_party_londonmnc0f.pdfIn PDF document text
    • http://poopo.ru/453712223094maku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nefomojuwet/visiting_card_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/kalijeto.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/36038740459.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 5052 bytes
SHA-256: 75bd88706a9cc311fd3342e2ecc26069ce01a1cedfb9c0a8acd50627432835c1
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 11504 bytes
SHA-256: 3297a7ec7b60e4859d5958c5a16957a9596c8ebad22e0ace89f5102c928dd65d
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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