Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd7aca8004aabe5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 05:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5b9e6ab6bdec2965fcafc4ed6e235058 SHA-1: d2a0e7ee2d564a8113d393c0cae9a9eed75984f2 SHA-256: 8dd7aca8004aabe528731c3063a8d61b6f563b81128535bfa053f45d98c1b4c1
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, indicating a phishing or scam attempt. The primary malicious URL, 'https://maypoin.ru/wix?keyword=you+are+a+badass+book+read+online+free', is presented as a lure for a free book, but redirects to a potentially malicious site. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as phishing malware.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/wix?keyword=you+are+a+badass+book+read+online+free PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_8ffbeffad4224132b082d6c1623342a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc9d6b1-a7b1-4c0f-bada-1f68618de47f/cuanto_equivale_3_metros_en_mm.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_4236bebb7b454804935f77ffa601c90a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/869d50bf-6590-469a-99e5-9431672c2f98/viterituduluwozuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ceb0fd-bb68-4ec3-8984-8d432a6b4bd2/sagumopetafometi.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_beb39a8c0d19436daf75e3394db12b0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e2ef4a-59f5-4ce8-8ffe-ab6e29408d63/how_to_pair_kohler_shower_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4fc987-8f96-4b5a-8cae-9fa984b6ebf9/war_horse_play_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d26c64a-3a99-4ef7-8a08-8530f26b2169/bojutexafexojopobozekig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/608f7f84-05b4-4145-b464-8aaa58644dbb/26161977904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef599e47-3996-49e9-91c9-d0b46146518e/true_freezer_t-23f_temperature_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c07136-2880-4a1b-a400-8c4932e896fd/what_the_bible_says_about_flowers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621517b1-5005-4ce1-938b-4359d886dd3d/govobolevo.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/gmat_prep_online_best.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_8df53d5b15ac4c7a967ce04a73f5fba8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb43695-9ca8-483a-ae57-30bee14e2540/90795536113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8e36ce-0b30-45cd-b35c-39261677e8db/5836432254.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_3f44f6922cfc43f89845bb4177f23d5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb0b924-b5db-412d-91f4-90b405767327/radotet.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/92231105406.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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 5068 bytes
SHA-256: eaddd07e2b29fcfadb5a1f0e0e8d14d4e65167b318d92c45df6a23d0fe41d629
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10504 bytes
SHA-256: fe590800c52216022516b975d5d8b4a6916795a2bef9da467fe9278b4f2eb69c