Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b092677107eb96…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 04:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9656c439c1b2fcfe0d9460ddbb0ad4a8 SHA-1: b8f00c8cb1b0a84887b5afa9edaebda70cb10ada SHA-256: c1b092677107eb962ecbf8183c416d2683dd028edf9db2e6b80667cf2616469e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The document body, though partially garbled, includes a title related to resetting a Schlage keypad, which is likely a lure to direct users to malicious sites. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/aws?utm_term=how+to+reset+my+schlage+keypad
    • https://nebolizeluxofid.weebly.com/uploads/1/3/0/8/130874408/2d8a67ff4077bf0.pdf
    • https://kolerekum.weebly.com/uploads/1/3/4/3/134350376/3f3ea3d86.pdf
    • https://cdn.sqhk.co/reparepoki/hejMdBj/goveduridabijuzej.pdf
    • http://gevotutux.22web.org/ecological_niche.pdf
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/332ab47142.pdf
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/0ca195f0.pdf
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/difak-nitivapekes.pdf
    • http://fegozerode.iblogger.org/diaper_genie_carbon_filter_insert.pdf
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/5738305.pdf
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/2930236.pdf
    • https://cdn.sqhk.co/soxuvezosapa/G84jejb/talolawamapepadifuzawajif.pdf
    • https://cdn.sqhk.co/ranotigu/jgicihU/28023081397.pdf
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/lovul.pdf
    • https://cdn.sqhk.co/pajijolabalu/gjUhjgE/4_pics_1_word_plus_level_644.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_5693fff31b59485eaeaa4d442f8ab15b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36c1adf2-b020-4ecc-a7c2-719d0bcea635/xokofupudevifikomev.pdf
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_667d986a275f4262b0c58ce6fdf4122a.pdf?index=true
    • http://bubomikofar.epizy.com/formal_letter_reason_absent_class.pdf
    • http://madojizekikozor.epizy.com/alginac_100_bula.pdf
    • http://ruxomipeb.epizy.com/15269890818.pdf
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_d0511a342bc348279d120fa88e8ca6fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1c23d93-11fb-40ce-8a18-797f5c3c330a/the_culture_map_review.pdf
    • https://uploads.strikinglycdn.com/files/6aa08278-de0e-438e-8723-9ee949871741/it_transition_plan_example.pdf
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_c52967b4283e4fb2b6452f0f7533c116.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb8.bin
6c3869653cb47f061049976e7f5928851f0dbfb6263fee94f25af54211e4db09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5704 bytes
font_01_sfnt_off0001000b.bin
8ee9d7d80d2b09e8e190283247fe2bf8ce3301e23145a988b5ea06575a4fc1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10800 bytes

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