Malicious PDF — malware analysis report

Static analysis result for SHA-256 12818358563a1660…

MALICIOUS

PDF

99.5 KB Created: 2021-04-25 22:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e11e663ef4faebf87f8cead532064b38 SHA-1: e6b07957b991aa8c6e1ae372370c2de8333f51d2 SHA-256: 12818358563a1660dac4de87fbe9aa0b84bfc97b41cfb8066fe745367592ee60
186 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 hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/strik?utm_term=which+trials+of+apollo+books+is+nico+in
    • https://cdn-cms.f-static.net/uploads/4416666/normal_604b7d3b41d7f.pdf
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/1362281.pdf
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/b6fa7022d82.pdf
    • http://clebohets.xyz/985594092578quzo.pdf
    • http://hangzhoumetal.ru/dolls_house_furniture_sets_smythswcneq.pdf
    • http://flipping-car.online/belevidemolusikegonobu83o.pdf
    • http://carbags.site/kibaxukebekowilokonoy2p4d.pdf
    • http://zanartcc.net/what_is_the_average_middle_class_income_per_yearf65c5.pdf
    • http://prostochillforum.fun/research_proposal_examples_psychologyy4250.pdf
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fcf0bc383a9e.pdf
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/wogoneribamiwok.pdf
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fcfe82f7da09.pdf
    • http://bogplaktnc.fun/626839687793v0yq.pdf
    • http://kellys.space/imagenes_de_arbol_de_navidad_para_dir3qze.pdf
    • http://nazhivy.net/pinijakamonenef3wvb.pdf
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5fcc1fc94223e.pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/makulufedijulabife.pdf
    • https://cdn-cms.f-static.net/uploads/4497372/normal_6029f1ace5918.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jonora/61399257211.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_7749d0a5eaf8457482c0ccf04c3607a4.pdf?index=true
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_8577291ee8544b98b74eb2a125854427.pdf?index=true
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_e2416eb2fe254b4cba76919488177fdf.pdf?index=true
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_e44979c9d551471d8beb50efa81c035a.pdf?index=true
    • https://s3.amazonaws.com/wobuzisibal/what_is_the_four_digit_code_for_my_panasonic_tv.pdf
    • https://s3.amazonaws.com/nevovumowa/how_to_check_serial_number_of_hp_laptop_in_command_prompt.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013999.bin
e11b49ac6b0b982dd24aa79d11704d4cca549bc808f7524dcdae0b1bbaec8f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 4988 bytes
font_01_sfnt_off00014a7c.bin
a2d79dab21fb9bacfd585b177176baed54a63d67488ab4cc400d8a53a0455733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7C 11620 bytes
font_02_sfnt_off00017229.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17229 4324 bytes

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