Malicious PDF — malware analysis report

Static analysis result for SHA-256 683e6f17982f6f75…

MALICIOUS

PDF

65.0 KB Created: 2021-03-25 21:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0749cc7230bd666d556a72d1b2332f1b SHA-1: 27648f20f093324cfe1c0ac09e38f801a482e5dd SHA-256: 683e6f17982f6f75db5d3cec0c564d93a74528d10a244f4d127b6badaa904e19
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. While the document body is heavily corrupted, the presence of numerous URLs suggests a potential phishing campaign or a method to distribute further malicious content. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=comparing+3+digit+numbers+worksheets+pdf
    • http://kogowetek.getenjoyment.net/88584453792.pdf
    • http://paxejunon.mygamesonline.org/medical_billing_and_coding_for_dummies_free.pdf
    • https://cdn.sqhk.co/zezegawutogu/is8gcie/69883584008.pdf
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/6551015.pdf
    • https://jotonude.weebly.com/uploads/1/3/1/3/131398177/4266105.pdf
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/3041598.pdf
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/7949268.pdf
    • https://cdn.sqhk.co/femokuxajuz/jJgg1je/jesajufomomeletumomotuto.pdf
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/2de524fe2fd678.pdf
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/vuvobu-segazolu.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/durune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f9f05cf-0298-45a9-9bb5-a892688ca0e5/catch_me_if_you_can_movie_online_free_watch.pdf
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_67f912414ae94d118559448600ab2eae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8cebd4b-c515-4148-bd1f-8c50bdee5aea/jozim.pdf
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_b175b23abac24085a76ce70036ec8577.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9eb2a080-f126-4f60-8fdf-cf180eccd137/wings_of_fire_memes_glory.pdf
    • https://uploads.strikinglycdn.com/files/5a1f1054-de4d-47c6-a144-2f001ce853a3/3060887241.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_c2dbdcf680584cf5a37acbbb4262b8cb.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_off0000c40a.bin
e16061179093530cb73cec2c2be34f721a1f0bfe63a8930c6054b228cdc9b3fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 5788 bytes
font_01_sfnt_off0000d79f.bin
d3776c476b01dee0960a8b8a06ba6765e33608ecb599b450148bb67c3ac44a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 9160 bytes

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