PDF malware analysis — malicious · a35d4753aa9102f6

MALICIOUS

PDF

84.3 KB Created: 2021-04-03 11:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: f06ac492bd3f1c5d542eb1e25ded529a SHA-1: 74fdd346eee019ea390cbc448f4f52bae9a795a5 SHA-256: a35d4753aa9102f67cd169015e591fb1f686f06fe533799938f2b5bb6909b950

86 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 5

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://dafemum.ru/award?keyword=banking+and+financial+awareness+pdf PDF link annotation
- https://cdn.sqhk.co/sugumujozik/vjhjbhc/avabel_lupinus_advanced_class_guide.pdfIn PDF document text
- https://cdn.sqhk.co/dodiniwotud/hcjdomi/bloomsburg_university_of_pennsylvania_acceptance_rate.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4464311/normal_5ff8fd2f6cf5c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454545/normal_600ba5a370528.pdfIn PDF document text
- http://fufejezonodim.mywebcommunity.org/warhammer_40k_8th_edition_army_books.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4389107/normal_6038c30986a70.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378834/normal_603c2c7d38e1f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4462096/normal_5fefdb7e221c7.pdfIn PDF document text
- http://degimogug.mypressonline.com/rubisona.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368229/normal_601e8f60a4a01.pdfIn PDF document text
- http://guparob.mywebcommunity.org/my_friend_dahmer_book_summary.pdfIn PDF document text
- https://cdn.sqhk.co/fifotadog/Vhchahh/labanuxufin.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4405895/normal_601fbc0c26b96.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378613/normal_606799091a48e.pdfIn PDF document text
- https://cdn.sqhk.co/dixejetafap/s6hfDja/camel_racing_dubai_january_2020.pdfIn PDF document text
- https://cdn.sqhk.co/zomulusiku/ughjjjf/pet_hospital_near_me_24_hours.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4492240/normal_606369c482d11.pdfIn PDF document text
- https://cdn.sqhk.co/muvotugi/ggES1rA/dororo_anime_2019_wikipedia.pdfIn PDF document text
- http://lomigakorak.getenjoyment.net/gitesaziwogukid.pdfIn PDF document text
- https://cdn.sqhk.co/raxuzuvuluf/qvhb7zC/tivasiv.pdfIn PDF document text
- https://cdn.sqhk.co/dekorasenu/akkhajd/canvas_student_guide_peer_review.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/xewamejixolefaj/how_to_say_test_in_korean.pdfIn PDF document text
- https://s3.amazonaws.com/mefadedosuw/33210520361.pdfIn PDF document text
- https://s3.amazonaws.com/xonobijikivo/chrome_for_android_2._3._6.pdfIn PDF document text
- http://motuvogipe.onlinewebshop.net/tendinitis_aquiliana_tratamiento.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fe23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE23	5124 bytes
SHA-256: `d33f46daaf8d32a8727559609ecb47c5cf17209103b279fb64f9592d5d777fc1`
`font_01_sfnt_off00010fac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FAC	11060 bytes
SHA-256: `d727d658fbfd9baa8a58d1cf3fb274009186a09e0cf12aaf362cf6b7039cf2d5`
`font_02_sfnt_off00013553.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13553	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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