Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8470862d728926f…

MALICIOUS

PDF

75.3 KB Created: 2021-03-27 11:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 40ab5c5fc8b1387e8ae861ffe5dcc524 SHA-1: ec74093191eaa946364ecb9dbd7d80bed1a6d355 SHA-256: d8470862d728926f87986e15a2bc7a2b83f546ef51e8da8bd06dc10fdba688d2
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm. It contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of a fake invoice lure further supports a phishing or scam-related objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/award?keyword=cedula+philippines+pdf In PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/munimosuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/zizunujozazi/VKgjl9k/the_kiss_list_episode_3_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/bn0he0K/rasibu.pdfIn PDF document text
    • https://nudomituge.weebly.com/uploads/1/3/4/6/134677479/1163301.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/c2ce5cc64196.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/15a5d31c5.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/como_convertir_de_a_word_en_macbook.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/40f256f0a09103.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/6676841.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/gfsjc7y/sewamisezuvovikapo.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/c98c21856272.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/suxoderazabokujelivuruf.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/jicijja/five_nights_with_froggy_3_daylight_edition.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/kukolejasixase.pdfIn PDF document text
    • https://fijesawe.weebly.com/uploads/1/3/4/6/134630878/071c54.pdfIn PDF document text
    • https://xotototovizeta.weebly.com/uploads/1/3/2/3/132303406/bojig.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/hem4hhT/93199849780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc24a1d4-9032-4b8e-9c81-f210d520deb0/how_much_does_it_cost_to_ship_25_lbs_ups.pdfIn PDF document text
    • http://nilipinuz.rf.gd/accidentally_sharing_a_post_on_facebook.pdfIn PDF document text
    • http://mipagolawalixa.onlinewebshop.net/8474051286.pdfIn PDF document text
    • http://soxomipimumoraz.rf.gd/890761105.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/tiluwafamitanawuzez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0be3ff3-e345-4fad-bc83-574bee080e78/how_to_pray_for_a_good_husband_for_my_daughter.pdfIn PDF document text
    • http://titugol.atwebpages.com/80211652888.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 4940 bytes
SHA-256: 9d2ac5233891318b42c96245aef5532e1dbb109972ad4cca632e823beaeecb11
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10904 bytes
SHA-256: ed3f8e5c9e5507eda26b125953efd5dc4413d9c20c1f901a91447ef479d886a8