Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55b864633623fee…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 07:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8f7d8532e58586384acd95934315fc36 SHA-1: 8b0a2e0118602336d55438a4da0d6f4b06c3771a SHA-256: e55b864633623fee62e1f124616114a1ade4776d5492d891d09cc05d8b265b6b
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic to potentially malicious sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://golowaki.ru/wix?keyword=how+to+hack+fun+run+2 PDF link annotation
    • https://bokasaveti.weebly.com/uploads/1/3/4/7/134725866/8b12dbddd5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_6026a45576ed6.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/nejukesi.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/buwolodusefukuwokoza.pdfIn PDF document text
    • http://jexemukanofefoj.iblogger.org/advantages_of_reading_comprehension.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_6000bbde2c47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_603f4d7a81819.pdfIn PDF document text
    • https://vojufeluwa.weebly.com/uploads/1/3/2/6/132681665/luvewexevalut_foxaromemufif_lasisegil_gowabu.pdfIn PDF document text
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/sukurawikedibisi.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/2500_usd_in_1960_worth_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_60419d64e8264.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/1160223.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/jeworurowam/genetically_modified_organisms.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_f7e7ad0e50f84001a817105435b4c121.pdf?index=trueIn PDF document text
    • http://zijubeda.rf.gd/king_arthur_brownie_bowl_pan_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/kidde_smoke_alarm_i12060_chirping.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_4800aa74143c4b2c9fba9c1082af1812.pdf?index=trueIn PDF document text
    • http://xowomowipuzu.epizy.com/carica_papaya_leaf.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_9f6d891143e7480cbcf806ffca5c14a7.pdf?index=trueIn PDF document text
    • http://wawefib.rf.gd/is_there_a_sign_test_to_get_your_license.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5008 bytes
SHA-256: d1b75b57eb30d79cf91053b8e7f2e279f3647146d57aa6f189d30b07cf0a9372
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 10380 bytes
SHA-256: f4609e699a5f617fe5510b21e0cb95574fd806944f8a0939749d9d83d9120aa7

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